Do Halogen-Hydrogen Bond Donor Interactions Dominate the Favorable Contribution of Halogens to Ligand-Protein Binding?

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TitleDo Halogen-Hydrogen Bond Donor Interactions Dominate the Favorable Contribution of Halogens to Ligand-Protein Binding?
Publication TypeJournal Article
Year of Publication2017
AuthorsLin, F-Y, Mackerell, AD
JournalJ Phys Chem B
Volume121
Issue28
Pagination6813-6821
Date Published2017 Jul 20
ISSN1520-5207
Abstract

Halogens are present in a significant number of drugs, contributing favorably to ligand-protein binding. Currently, the contribution of halogens, most notably chlorine and bromine, is largely attributed to halogen bonds involving favorable interactions with hydrogen bond acceptors. However, we show that halogens acting as hydrogen bond acceptors potentially make a more favorable contribution to ligand binding than halogen bonds based on quantum mechanical calculations. In addition, bioinformatics analysis of ligand-protein crystal structures shows the presence of significant numbers of such interactions. It is shown that interactions between halogens and hydrogen bond donors (HBDs) are dominated by perpendicular C-X···HBD orientations. Notably, the orientation dependence of the halogen-HBD (X-HBD) interactions is minimal over greater than 100° with favorable interaction energies ranging from -2 to -14 kcal/mol. This contrasts halogen bonds in that X-HBD interactions are substantially more favorable, being comparable to canonical hydrogen bonds, with a smaller orientation dependence, such that they make significant, favorable contributions to ligand-protein binding and, therefore, should be actively considered during rational ligand design.

DOI10.1021/acs.jpcb.7b04198
Alternate JournalJ Phys Chem B
PubMed ID28657759
PubMed Central IDPMC5523114
Grant ListR01 GM072558 / GM / NIGMS NIH HHS / United States